Chorus is the choice of high level athletes. It shares its genetic makeup with Record and this designates it for competition as does its level of reliability, life and construction tolerances, even if they are obtained through the use of a few less carbon composite parts.

The Chorus Ultra Narrow 10s chain is just 5.9mm wide. These dimensions make it lighter and quieter and facilitate adjustment of the rear derailleur. The links have been lightened so that the chain weighs only 269 grams in all.

Features & Benefits: 

• Width 5.9mm  -  quiet operation, less interference with adjacent sprockets and chainrings, high-performance shifting
• HD-Link™  -  extremely high retention force
• Lightened links  -  weight savings
• Antifriction treatment  -  smoothness, long life 

Tech Specs:

• Width 5.9 mm
•  Ni-PTFE Finish
• 114 links
• Ultra·Drive
• HD-Link for Ultra Narrow chain
• Lightened links
• Weight : 269g